Horridocactus engleri F.Ritter in Succulenta (Netherlands) 1959: 76. 1959
Horridocactus engleri in Succulenta (Netherlands) 1959: 76. 1959
is basionym for Eriosyce engleri, Eriosyce (Cactac.) Gen. Revis. Ampl.: 118. 1994
is basionym for Neoporteria curvispina var. engleri, Cact. Fl. Silvestre Chile: 182. 1989
is basionym for Pyrrhocactus engleri in Succulenta (Netherlands) 1959: 131. 1959
is basionym for Neoporteria engleri in Cact. Succ. J. Gr. Brit. 28: 56. 1966